Party drinks like margaritas or mai tais can be heavy on the calories, especially when you don’t make them yourself. The key with cocktails is to skip mixers like soda, juice, or premade cocktail blends. Instead, sip on something simple, like vodka and club soda. A 1-ounce serving of vodka ranges from 70 to 100 calories, and club soda doesn’t add any calories. If you need more flavor, try a spice-infused vodka.